Plumbing frag tank into main display

I ordered this frag tank:

http://ift.tt/1LvQ74T



I was wondering what would be the best drain to use on it and should I just use my main tanks return pump to pump water to this tank to? Or is a new pump in order? I have a Eheim 3000 return pump on my 50g display right now. For the drain i was thinking a Herbie overflow and use 3/4 pvc for the drain and 1/2 pvc for the retun.



Any thoughts?